Shiva Purana
शत्रुश्च मारितस्तेन पुनर्बाणश्च रक्षितः ॥ अत्यन्तं च कृतघ्नोसि तपोशुभकरस्तथा ॥ १६ ॥
Your enemy has been killed by him and you have kept the arrow to yourself. Very ungrateful indeed are you. You are making your own penance fruitless.
english translation
zatruzca mAritastena punarbANazca rakSitaH ॥ atyantaM ca kRtaghnosi tapozubhakarastathA ॥ 16 ॥
hk transliteration by Sanscript